DOBU MASK, Inc. engages in the provision of advertising agency services. It operates through the following business divisions: Accelerator, Advertising, O2O, and Education. The Accelerator division provides business development, alliance pitching day, chief executive officer education program, synergy conference, and others. The Advertising division offers advertisements on subways. The O2O division provides oil distribution services. The Education division offers child education, oversea studies, and education solutions. The company was founded on February 16, 2007 and is headquartered in Seoul, South Korea.